/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2022, Microsoft Corporation. * * Authors: * Beau Belgrave <beaub@linux.microsoft.com> */ #ifndef _LINUX_USER_EVENTS_H #define _LINUX_USER_EVENTS_H #include <linux/list.h> #include <linux/refcount.h> #include <linux/mm_types.h> #include <linux/workqueue.h> #include <uapi/linux/user_events.h> #ifdef CONFIG_USER_EVENTS struct user_event_mm { struct list_head mms_link; struct list_head enablers; struct mm_struct *mm; /* Used for one-shot lists, protected by event_mutex */ struct user_event_mm *next; refcount_t refcnt; refcount_t tasks; struct rcu_work put_rwork; }; extern void user_event_mm_dup(struct task_struct *t, struct user_event_mm *old_mm); extern void user_event_mm_remove(struct task_struct *t); static inline void user_events_fork(struct task_struct *t, unsigned long clone_flags) { struct user_event_mm *old_mm; if (!t || !current->user_event_mm) return; old_mm = current->user_event_mm; if (clone_flags & CLONE_VM) { t->user_event_mm = old_mm; refcount_inc(&old_mm->tasks); return; } user_event_mm_dup(t, old_mm); } static inline void user_events_execve(struct task_struct *t) { if (!t || !t->user_event_mm) return; user_event_mm_remove(t); } static inline void user_events_exit(struct task_struct *t) { if (!t || !t->user_event_mm) return; user_event_mm_remove(t); } #else static inline void user_events_fork(struct task_struct *t, unsigned long clone_flags) { } static inline void user_events_execve(struct task_struct *t) { } static inline void user_events_exit(struct task_struct *t) { } #endif /* CONFIG_USER_EVENTS */ #endif /* _LINUX_USER_EVENTS_H */